<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>表单标签演示</title>
</head>
<body>
    <h1>表单标签演示</h1>
    <form action="">
        <label for="username">用户名</label>
        <input
        type="text"
        name="username"
        id="username"
        placeholder="请输入用户名"
        />
        <label for="password">密码</label>
        
</body>
</html>